Grinding-machine.



G. P. TAYLOR & H. ROGHEF ORT. GRINDING MACHINE.

. APPLICATION FILED JUNE 9, 1908. 914,763, Patented Mar. 9, 1909.

2 SHEETS-SHEET l,

G. P. TAYLOR a; H. ROOHEFORT.

GRINDING MACHINE.

APPLICATION FILED JUNE SJ, 1908.

Patented Mar. 9, 3.909.

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40 ing a clutch of a suitable feeding mechanism UNlTED STATES arana OFFICE.

azon ir\ rnansR ck TAYLOR AND HENRY ROCHEFORT, or KINGS HEATH, NEAR BIRMINGHAM, ENGLAND.

GRINDING-MACHINE Specification of Letters Yatent- Patented March 9, 1909.

Application filed June 9, 19l18. Serial No. 437,579.

To all whom, it may concern:

useful Im iroveinents telatin r to Grindin is a Machines of which the following is a specitication.

This invention relates to machines for grinding metal articles accurately to the required dimensions and has for its object to construct an improved machine of the type in which the size of the finished work pieces is uuatfected by variations in the diameters .of the grinding disks caused, for instance,

by wear. I

Referring to the two accompanying sheets of explanatory d1'awings:l igure 1 is a diagrammatic side elevation of a trip device constructed in accordance with this invention. Figs. 2 and 3 are respectively part sectional plan and front elevation showing diagrammatically to a smaller scale'than Fig. 1 a machinehavingfour invention applied thereto. 7

' The same reference characters in the different views indicate the same parts.

In a machine for grinding parallel shafts or spindles as illustrated, a pair of trip devices are employed, one for diminishing the feed and the other for arresting the same. Such trip consists of a bell crank lever a and a pivoted stop orabutment piece I) mounted on a slide 0 which is adjustable by means of a suitable screw with respect to a bracket (Z secured to the bed or the slide of the machine. One end of the bell crank lever 05 is connected to arod e which is itself connected to an abutment lever f for operatas. hereinafter described. The other end of the bell crank lever rests when the apparatus is set, against the end of the pivotal stop as shown. For feed changing the first trip is so adjusted witl. respect to the work 'piere that when the diameter of the work approaches the finished sizethe periphery of the grinding disk It touches the stop I) and rotates the about its pivot. The bell cranklever is thus released and the rod (1 aforesaid under the influence of a spring 2' acting on the lever a is raised and so caused to lower the abutment lever f int position for operating the clutch above referred to. For stopping the feed, the second trip is so adjusted that the disk It touches it as soon as the work piece-is ground to the finished diameter. The lever f of this trip may either be adapted to actuate the same clutch as the corresponding lever of the first trip and move the clutch into an inopcrativeposition for stopping the fouling mechanism, or it may be arranged to act upon'an independent feed arresting clutch.

To avoid abrasion of the pivotal stops b by the grinding disk, each stop is fitted with a diamond j or other exceeding] hard material on which the grinding disk has no appreciable action. Contact between the step and diskis effected through the medium of the diamond or the like.

The feeding mechanism consists in one convenient form of two trains of wheels k and 1 arranged through the medium of shafts m and n in conjunction with a feeding screw it of the grinding disk slide. On the shaft m there is also mounted a hand wheel 0. The wheel trains are pro )ortioned to give either a coarse or a fine ccd. At the end of each reciprocatory motion or traverse of the work with respect to the disk, or vice versa, an operative movement is given to the feed mechanism by means of a convenient ratchet 1 and pawl q operated by a spring controlled tappet or plunger A Motion is given to the plunger by a lever 2 on the shaftt which also carries a striking 90 the actuation of the first trip mechanism the lever f thereof is put into position for operating (on the next traverse of the slide) a lever 2'. With the movement of the said 'lever theclutc'his carried into engagement with the-fine feedtrain Z. ()n the operation of the second trip the corresponding lever is lowered so that on-the succeeding move ment of the slide the lever 3 is acted u on and the clutch is moved into its centra or inc erative position where neither of the fee trains are engaged.

For traversing the 'Work slide an convenient and suitable mechanism may be employed, for example, a rack 4 operated by a wheel 5 which can be actuated by hand from a wheel 6, or automatically by bevel wheels 7, 8, 9 and 10, fron1 the pulleys 11. To reverse the direction of traverse 011's or other of the wheels 8 and 9 is geared with the wheel 7. The required movement of the said bevel wheels 8 and 9 is obtained at the end of each traverse of the slide by levers 12 and 13, connected as shown to the lever u. lVhen the latter is moved by one of the sto s a the ratchet is operated and simultaneous y the motion of the slide is reversed. Eltective operation of the wheels 8 and 9 is insured by the spring of the plunger 7', for after the lover s has just passed the apex of the plungerthe recovery of the spring causes the movement of the lever s and its asso-.

ciated mechanism to be completed. With the operation of the clutch leverby the lever 3 the levers 12 and 13 are also actuated owing to the abutment of the said lever'3 against a lever 14: on the shaft 5. By the engagement with the lever 3 of a snug 15 on the lever 14 the motion of the levers 12 and 13 is arrested when the wheels 8 and 9 are in the mid or inoperative position. Consequently the feeding and traversing mechanism are both stop ed simultaneously.

Any ordinary form of or puppets .as 16 and 17 may be adapted for supporting and rotating the work.

A machine constructed as hcreinbefore described enables Work of uniform accuracy to be obtained independently of wear or variations arising from other causes in the diameters of the grinding disks and also enables such results to be produced consistently, as the mechanism employed is reliable and not readily deranged or thrown out of order as in the case where electrical controls or stops are provided.

Having thus described our invention what we claim as new and desire to secure by Letters Patent is 1. In grinding machines, the combination with the grinding disk, and lateral and transverse feeding mechanism, of a pivoted stop arran 'ed for actuation by the disk, a bell crank levcr in contact with said stop, and a mechanical :t'eed controlling device operated with the movements of the said lever, substantially as set forth.

2. In grinding machines, the combination with a grinding disk, and lateral-and trans- 1ve and back centers verse feeding mechanism, of a pivoted sto arranged for actuation by the disk, :1 bell crank lever in contact with the stop, an abutment lever, a bar connecting the said levers together, and mechanical means for operating the feeding mechanism from the. a 3

the bell crank lever and. stop are mounted,

and mechanical means for operating the feeding mechanism :t'rom. "the abutment lever, substantially as set forth.

4. In grinding machines, the combination with a grinding disk, and lateral andtrens verse feeding mechanism, of a pivoted stop arranged for actuation by the disk, bell crank lever in contact with the stop, an abutment lever, a bar connecting the said levers together, a spring where 3y the sad levers and rod are operated on the tion of the stop by the grinding dish, mechanical means for o crating the feeding mechanism from the a ntment lever, substantially as set forth.

5. In grinding machines, the combination. with a grinding disk, and lateral feeding mechanism, of a transverse feeding screw, a pair of wheel trains in conjunction with the screw, a ratchet and pawl operated from the lateral feeding mechanism,

ever, apivoted stop arranged for actuation by the grinding disk, and actuating mechanism for the said clutch lever, said mechanism being held out of action by the stop and liberated when the stop operated by the disk, substantially as set forth.

' 6. In grinding machines, the combination with a grinding disk, and transverse feed ing mechanism, of a rack and pinion, versing bevel wheels in conjunction with the said pinion, actuating levers for the said bevel wheels, operating stops for th said levers, a pivoted stop arranged. for actuation by the grinding disk, and means for arresting the actuating levers of the reversing wheels, said means being held out of action by the pivoted stop and liberated when the stop is operated by the grinding disk, substantially as set forth, ,f

7. In grinding machines', the combination comprisingv a reciprocatory work'supporting bed, a grinding disk l'auterally movable with; respect to the work supporting bed, a

pair of pivoted stops mounted on the said bed and arranged for actuation by the grinding disk, feeding mechanism for 

